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Buffer-gas cooling of antiprotonic helium to 1.5 to 1.7 K, and antiproton-to–electron mass ratio
/ Hori, Masaki (Munich, Max Planck Inst. Quantenopt.) ; Aghai-Khozani, Hossein (Munich, Max Planck Inst. Quantenopt.) ; Sótér, Anna (Munich, Max Planck Inst. Quantenopt.) ; Barna, Daniel (Wigner RCP, Budapest) ; Dax, Andreas (Tokyo U.) ; Hayano, Ryugo (Tokyo U.) ; Kobayashi, Takumi (Tokyo U.) ; Murakami, Yohei (Tokyo U.) ; Todoroki, Koichi (Tokyo U.) ; Yamada, Hiroyuki (Tokyo U.) et al.
Charge, parity, and time reversal (CPT) symmetry implies that a particle and its antiparticle have the same mass. The antiproton-to-electron mass ratio Embedded Image can be precisely determined from the single-photon transition frequencies of antiprotonic helium. [...]
2016
- Published in : Science 354 (2016) 610-614
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Beam diagnostics for measurements of in-flight annihilation cross sections of antiprotons at 130 keV
/ Aghai-Khozani, Hossein (CERN ; Munich, Max Planck Inst. Quantenopt.) ; Barna, Daniel (Wigner RCP, Budapest ; Tokyo U.) ; Corradini, Maurizio (INFN, Brescia ; Brescia U.) ; Hayano, Ryugo (Tokyo U.) ; Hori, Masaki (Munich, Max Planck Inst. Quantenopt. ; Tokyo U.) ; Kobayashi, Takumi (Tokyo U.) ; Leali, Marco (INFN, Brescia ; Brescia U.) ; Lodi-Rizzini, Evandro (INFN, Brescia ; Brescia U.) ; Mascagna, Valerio (INFN, Brescia ; Brescia U.) ; Prest, Michela (INFN, Milan Bicocca ; Insubria U., Como) et al.
The ASACUSA (the Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration of CERN is currently attempting to measure the antiproton-nucleus in-flight annihilation cross sections on thin target foils of C, Pd, and Pt at the kinetic energy of 130 keV. The low-energy antiprotons were provided by the Antiproton Decelerator of CERN and a radio-frequency quadrupole decelerator developed by the ASACUSA collaboration. [...]
2015 - 4 p.
- Published in : JPS Conf. Proc. 6 (2015) 030111
In : 2nd Conference on Advances in Radioactive Isotope Science, Tokyo, Japan, 1 - 6 Jun 2014, pp.030111
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Observation of the 1154.9 nm transition of antiprotonic helium
/ Kobayashi, Takumi (Tokyo U.) ; Barna, Daniel (Tokyo U. ; Wigner RCP, Budapest) ; Hayano, Ryugo (Tokyo U.) ; Murakami, Yohei (Tokyo U.) ; Todoroki, Koichi (Tokyo U.) ; Yamada, Hiroyuki (Tokyo U.) ; Dax, Andreas (PSI, Villigen) ; Venturelli, Luca (U. Brescia ; INFN, Brescia) ; Zurlo, Nicola (U. Brescia ; INFN, Brescia) ; Horvath, Dezso (Wigner RCP, Budapest ; Debrecen, Inst. Nucl. Res.) et al.
The resonance transition $(n,l)=(40,36)\to(41,35)$ of the antiprotonic helium ($\overline{\mathrm{p}}^{4}$He$^{+}$) isotope at a wavelength of 1154.9 nm was detected by laser spectroscopy. The population of $\overline{\mathrm{p}}^{4}$He$^{+}$ occupying the resonance parent state $(40,36)$ was found to decay at a rate of $0.45\pm0.04$ $\mu$s$^{-1}$, which agreed with the theoretical radiative rate of this state. [...]
CERN-PH-EP-2013-175.-
Geneva : CERN, 2013 - 9 p.
- Published in : J. Phys. B 46 (2013) 245004
Draft (restricted): PDF; Fulltext: PDF;
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PS AND SPS EXPERIMENTS COMMITTEE
/ Gabrielse, Gerald (speaker) ; Hayano, Ryugo (speaker) ; Bowe, Paul David (speaker) ; Magnon, Alain (speaker) ; Gazdzicki, Marek (speaker) ; Pugnat, Pierre (speaker)
09:00 AD-2, ATRAP (30') Gerald Gabrielse (Harvard University)
09:40 AD-3, ASACUSA (30') Ryugo Hayano (Department of Physics - Faculty of Science - University of Tokyo)
10:20 AD-5, ALPHA (30') Paul David Bowe (Aarhus University)
11:00 COFFEE BREAK
11:20 COMPASS Future Programme (30') Alain Magnon (DAPNIA)
12:00 NA49 Future Proposal (30') Marek Gazdzicki (University of Frankfurt, Frankfurt, Germany and Swietokrzyska Academy, Kielce, Poland)
12:40 QED test and axion search by means of optical techniques (30') Pierre Pugnat (CERN)
13:30 LUNCH BREAK
2007 - 9611.
SPSC Meeting
External link: Event details
In : PS AND SPS EXPERIMENTS COMMITTEE
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SPSC open session
/ Testera, Gemma (speaker) ; Gabrielse, Gerald (speaker) ; Hayano, Ryugo (speaker) ; Bueno, Antonio (speaker)
09:00Status Report of AD1/ATHENA (30')Gemma Testera(INFN, Sezione di Genova)
09:40 Status Report of AD2/ATRAP (30') Gerald Gabrielse(Harvard University, Cambridge, MA)
10:20 Status Report of AD3/ASACUSA (30') Ryugo Hayano(Tokyo University)
11:00 ICARUS: A Second-Generation Proton Decay Experiment and Neutrino Observatory at the Gran Sasso Laboratory (30' document)Antonio Bueno (Universidad de Granada)
Note: The Session will be webcasted.
Closed Session, after the Open Session, 6th Floor Conference Room, Main Building..
2004 - 10655.
SPSC Meeting
External link: Event details
In : SPSC open session
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Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3
/ Friedreich, Susanne (Stefan Meyer Inst. Subatomare Phys.) ; Barna, Daniel (Tokyo U. ; Budapest, RMKI) ; Caspers, Fritz (CERN) ; Dax, Andreas (Tokyo U.) ; Hayano, Ryugo S (Tokyo U.) ; Hori, Masaki (Tokyo U. ; Garching, Max Planck Inst.) ; Horváth, Dezső (Budapest, RMKI ; Debrecen, Inst. Nucl. Res.) ; Juhász, Bertalan (Stefan Meyer Inst. Subatomare Phys.) ; Kobayashi, Takumi (Tokyo U.) ; Massiczek, Oswald (Stefan Meyer Inst. Subatomare Phys.) et al.
In this work we describe the latest results for the measurements of the hyperfine structure of antiprotonic helium-3. [...]
arXiv:1303.2831.
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2013. - 15 p.
Preprint
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